Book excerpt: On August 3, 1948, "Time" magazine editor Whittaker Chambers made a stunning allegation before the House Un-American Activities Committee: Alger Hiss, former high-ranking State Department official, had served with him in the Communist underground. Hiss's defense was the gripping story of its day, and the question of his guilt remains an enigma. This book provides fascinating insights into the case and into the American political life of the 1930s and 1940s. of photos.